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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80203f9f4459bdadab26b5a12906be2384397d5316a8d8d59363c85b22f9afd9' 
  AND token = 'orYrDBs9pRnds6cJx5fjzs5Onu5RLWDyU/ybGOwTDJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}